Differentiating Expressions and Equations in Algebra

What is the main difference between expressions and equations?

• Expressions have an equal sign, equations do not.

• Equations can change values, expressions cannot.

• Equations have an equal sign, expressions do not.

• Expressions are full math sentences, equations are not.

Which of the following best describes an expression?

• A full math sentence with a variable that cannot change.

• A full math sentence with an equal sign.

• A math phrase that is part of a full sentence.

• A math phrase with a defined variable value.

In the expression 7 + x, if x equals 5, what is the result?

• 12

• 7

• 5

• 2

If d equals 20 in the expression 3d, what is the result?

• 23

• 60

• 20

• 3

Which of the following is an example of an expression?

• R = 15

• 9 + N = 11

• 5R = 75

• 7 + x

Which of the following is true about equations?

• They are part of a math phrase.

• The variable can have multiple values.

• They do not have an equal sign.

• They are the full math sentence.

In the equation 9 + N = 11, what is the value of N?

• 9

• 5

• 2

• 11

What is the value of R in the equation 5R = 75?

• 20

• 5

• 75

• 15

Which of the following statements is true about variables in equations?

• They can change values.

• They have a defined or set value.

• They are part of a math phrase.

• They do not have an equal sign.

What is the result of isolating the variable in the equation 3R = 45?

• R = 15

• R = 12

• R = 45

• R = 3